/***
 * ASM Guide
 * Copyright (c) 2007 Eric Bruneton, 2011 Google
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package cn.zwy.tree.day1;

import java.util.Iterator;

import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.FieldNode;

/**
 * ASM Guide example class.
 * 
 * @author Eric Bruneton
 */
public class RemoveFieldTransformer extends ClassTransformer {

  private String fieldName;

  public RemoveFieldTransformer(ClassTransformer ct, String fieldName) {
    super(ct);
    this.fieldName = fieldName;
  }

  public void transform(ClassNode cn) {
    Iterator<FieldNode> i = cn.fields.iterator();
    
    // 遍历字段 ， 如果相同则删除
    while (i.hasNext()) {
      FieldNode fn = i.next();
      if (fieldName.equals(fn.name)) {
        i.remove();
      }
    }
    super.transform(cn);
  }
}
